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Panasonic Home Business > Industrial Devices > Automation Controls Top > Components & Devices > Relays / Couplers > Power Relays (Over 2A) > Difference between Polarized and Non-polarized Relays


Difference between Polarized and Non-polarized Relays

Mechanical relays Selection Guide

1.Difference between Polarized and Non-polarized Relays

  Non-polarized Polarized
Main relays
Contact arrangement
1a, 1c
1a, 1b, 1c, 2a, 2b, 2c, 1a1b, 4a, 4c, 2a2b, 3a1b
Latching type
Without
With
Nominal operating power
(Comparison: 10A type)
LQ relays 200 mW
(1 Form A contact only)
DK relays 200 mW
Vibration and shock resistance
Weak compared to polarized relays.
Strong compared to non-polarized relays.

2.Features of polarized power relay

1.Latching type

Coil power consumption can be controlled, because ON or OFF state of relay contact can be held using pulse input (zero power consumption when there is no pulse drive).

Non-polarized (non-latching) type Polarized (latching) type
Current flows endlessly through coil
Power saving realized with pulse drive

2.High sensitivity

When compared under the same contact capacity, the polarized relays are more sensitive than non-polarized relays.

Compared with 10 A switching capacity LQ relays 200 mW (1 Form A contact only)
DK relays 200 mW

3.Superior vibration resistance

Vibration resistance (Functional) LQ relays 10 to 55 Hz (double amplitude of 1.6 mm)
DK relays 10 to 55 Hz (double amplitude of 3 mm)

4.Superior NC (b contact) switching ability

Contact bouncing when resetting is controlled thanks to power of permanent magnet.
NC switching ability at same level as NO (a contact) is maintained.

●During relay reset

Non-polarized type Polarized type
Bouncing is pronounced, because resetting is carried out only by the power of the contact string.
⇒ Much damage to the contact
Positive resetting to NC thanks to the double power of contact spring and permanent magnet.
⇒ Little damage to the contact


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